Control method for off-highway vehicle electric drive system

Abstract

The invention discloses a control method for an off-highway vehicle electric drive system. The method includes obtaining the operation parameters of a current diesel engine power generation system, and determining the first power of a traction motor according to a pre-constructed relation model between the operation parameters of the diesel engine power generation system and the traction motor; and determining the current maximum output torque of the traction motor through calculating according to the first power, calculating the output torque of the traction motor according to the maximum output torque, and controlling the output of the traction motor. The method has acceleration and deceleration instructions which can rapidly respond to drivers and can control power output with maximum efficiency, so that traction faults caused by excessively fast response can be effectively prevented; and the method can provide effective protection for a traction system.

Description

technical field [0001] The invention relates to the technical field of off-highway vehicle transmission control, in particular to a control method for an off-highway vehicle electric transmission system. Background technique [0002] Off-highway vehicles are a kind of large-scale mine development engineering machinery widely used in mine sites. The traction electric drive system is the core component of off-highway vehicles, such as figure 1 shown. However, off-road vehicles operate in harsh environments and the road conditions are complex and changeable. The electric drive system of off-road vehicles is equipped with a large diesel engine with a displacement of more than 100 liters and a total power of more than 3,700 horsepower. Such a large power consumes amazing fuel and causes great damage air pollutant emissions. [0003] Off-highway vehicles have two working conditions in normal operation: the traction condition pulls the whole vehicle forward or backward, and the b...

AI Technical Summary

Problems solved by technology

[0004] At present, the off-highway vehicle traction system is driven by an AC drive system, which is a typical AC drive system of a diesel locomotive. The diesel engine drives the shaft-connected generator to provide vehicle power energy, and the traction inverter drives the motor; The traction electric transmission system needs to quickly respond to the driver's acceleration and deceleration commands. There is a contradiction between the drive system diesel power generation system being a slow system and the traction converter and motor being a fast response system. During the operation of the system, the response is too fast and it is easy to fail Overcurrent and overvoltage of the traction electric transmission system and the failure of the vehicle to lose traction. If the response is too slow, it will easily lead to poor acceleration and deceleration performance, which does not meet the actual application requirements of mines.

At present, in terms of power control of the traction electric drive system of off-highway vehicles, the traction electric drive system needs to respond quickly to the driver's acceleration and deceleration commands. There is a contradiction between the drive system diesel power generation system being a slow system, and the traction converter and motor being a fast response system. During operation, if the response is too fast, it is easy to cause overcurrent and overvoltage in the traction electric drive system and the vehicle loses traction failure accidents. If the response is too slow, it is easy to cause poor acceleration and deceleration performance, which does not meet the actual application requirements of mines.

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